My grandfather's 4x5 Graflex RB has been passed on from him to my father (who used it a lot in the 50's and 60's) to me. I would appear from his photos that he was using a 5x7 camera with some sort of roll film and plates in the 1910 - 1914s. I have 4x5 autochrome plates from 1924 so he must have been using it by then.
It has two lenses a Taylor and Hobson Cooke 7-1/2" Series IIA 3.5 and a Taylor and Hobson 10.4" Cooke series II lens with soft focus adjustment.
I was wondering when this would have been made?
If the camera would have come with the 7-1/2" lens or if this was added later. I know he researched and bought the portrait lens.
Are there any instructions to adjust the shutter speed?

I forgot the serial number on the camera body; 94807.

94807 is one in batch of 350 4x5 RB Auto Graflex serial numbers issued between 1916 and 1920. When the camera was made can't be known.